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Central heating system with low-temperature backwater

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Publication number
CN202221124U
Authority
CN
Grant status
Grant
Patent type
Prior art keywords
temperature backwater
backwater
central heating
primary network
heating
Prior art date
Application number
CN 201120305120
Other languages
Chinese (zh)
Inventor
付林
姜云涛
张世钢
罗勇
肖常磊
Original Assignee
北京华清泰盟科技发展有限公司
清华大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BINDEXING SCHEME RELATING TO CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. INCLUDING HOUSING AND APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10Integration of renewable energy sources in buildings
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/08Energy efficient heating, ventilation or air conditioning [HVAC] relating to domestic heating, space heating or domestic hot water heating or supply systems [DHW]
    • Y02B30/12Hot water central heating systems using heat pumps

Abstract

The utility model discloses a central heating system with low-temperature backwater. A technical solution of the central heating system is characterized in that: each thermal station of a thermal network is provided with a heat pump type heat exchanger set; backwater temperature of primary network hot water is reduced; primary network backwater with low temperature is firstly introduced into a condenser in a power plant; and a steam turbine is used for performing exhaust steam heating. The central heating system with the low-temperature backwater is mainly characterized in that: firstly, the heat pump type heat exchanger set is provided in each thermal station of the thermal network, compared with the routine central heating mode, the central heating system with the low-temperature backwater has the advantages of furthermore reduced backwater temperature of the primary network, further increased temperature difference between supplied water and backwater of the primary network, improved transmission capability of the thermal network, and increased possibility of recycling wasteheat of the exhausted steam of the steam turbine of the power plant; and secondly, the condenser is utilized for performing primary heating on the backwater of the primary network in the power plant, thereby effectively recycling wasteheat of the exhausted steam of the turbine, and improving heat supply capability of the power plant.

Description

一种低温回水的集中供热系统 A cryogenic backwater central heating system

技术领域 TECHNICAL FIELD

[0001] 本实用新型属于集中供热领域,涉及一种低温回水的集中供热系统。 [0001] The utility model belongs to the field of central heating, to a cold backwater central heating system. 背景技术 Background technique

[0002] 随着城市规模的不断发展,城市集中供热面积不断增大,带来了两个方面的问题: 一是集中供热热源的能力不足,新建大型的热源投资高、建设周期长,并且受到环境容量的强烈制约,一些地方盲目发展小型燃煤锅炉房,给大气带来了严重的污染,一些地方盲目发展燃气采暖、甚至电采暖,在带来采暖高成本的同时,造成了燃气、电力的全面紧张;二是热源产生的高温热水往往需要经过较长距离的输送才能到达末端用户,目前城市集中供热的一次网供、回水温度一般为120〜60°C,由于受到二次网用热要求的限制,回水温度利用常规的换热器已经无法再降低了,因此热水的输送量非常大,使得供热半径小、管道投资大以及水泵运行电耗大等问题日益凸现。 [0002] With the development of city size, urban central heating area is increasing, bringing two aspects: First, lack of capacity of the central heating source, high source of new large-scale investment, long construction period, and by the strong environmental capacity constraints, some local blind development of small coal-fired boiler room, to the atmosphere caused serious pollution in some places the blind development of gas heating, electric heating even at the same time bring the cost of heating, resulting in a gas , the overall tension power; the second is hot water heat sources often need to go through a long distance transport to reach the end user, there's a network of urban central heating supply and return water temperature is generally 120~60 ° C, due to limit the secondary network thermal requirements, return water temperature using a conventional heat exchanger can no longer reduced, and therefore the amount of hot water delivery is very large, the small radius of heating, plumbing and pump run large investment power consumption and other issues become more apparent.

[0003] 此外,火力发电厂在发电过程中,汽轮机乏汽中的余热资源没有得到有效利用,被循环水带到冷却塔散热或直接进入空冷岛冷却,热量直接排向大气,白白的浪费掉。 [0003] In addition, the thermal power plants in the power generation process, the turbine exhaust steam in a waste heat has not been effectively utilized by circulating water to the cooling tower, or directly into the air-cooled Island cooled heat directly to the atmosphere, white wasted . 如果能够利用火力发电厂的这部分汽轮机乏汽热量,相当于在不增加电厂容量、不增加当地排放的情况下,扩大了热源的供热能力,但因为其热能品质较低目前尚没有得到有效的利用。 If you can take advantage of this part of the power plant turbine exhaust steam heat, equivalent without increasing plant capacity, without increasing the local emission situation, the expansion of the heating capacity of the heat source, but because of its low quality thermal energy is currently no effective It uses.

发明内容 SUMMARY

[0004] 针对上述问题,本实用新型提出了一种能够有效降低热网回水温度,并在电厂内利用汽轮机乏汽余热来加热一次网热水的集中供热方式,不但能够缓解集中供热热源能力不足的问题,还能够大幅提高热网的输送能力,降低输送能耗。 [0004] In response to these problems, the utility model can effectively reduce the heat a net return water temperature, and the use of turbine exhaust steam heat in the district heating plant to heat the way a network of hot water, not only to alleviate the central heating insufficient heat capacity issues, but also a substantial increase in transmission capacity heating network and reduce transportation energy consumption.

[0005] 本实用新型的技术方案是在热网的各个热力站中设置热泵型换热机组(专利号: ZL200810101064. 5),高温的一次网供水送出电厂后,进入到所述热泵型换热机组中,加热二次网热水供给热用户,同时实现一次网热水降温,并远远低于二次网的回水温度,这为利用电厂汽轮机乏汽余热提供了可能;低温的一次网回水回到电厂后,首先进入凝汽器中,被汽轮机乏汽加热,加热到一定温度后再进入汽-水换热器中,被来自汽轮机抽汽管路的高温蒸汽进一步加热,加热后的高温一次网热水作为一次网供水再送出电厂,完成循环。 [0005] The utility model technical solution is to set heat pump heat exchanger unit (patent number.: ZL200810101064 5) in each thermal station in heating network, a network of high-temperature water sent after the plant, into the heat pump heat exchanger unit, the secondary heating network hot water supply heat users, while achieving a net cooling of hot water, and far less than the return temperature of the secondary network, which for the use of power plant turbine exhaust steam heat may be provided; low primary network after the return back to the power plant, the first into the condenser, the turbine exhaust steam is heated, heated to a certain temperature before entering the steam - water heat exchanger, is further heated high-temperature steam from the turbine extraction steam pipe, heating a high-temperature hot water network as the primary network water power plant sent out again, completing the cycle.

[0006] 所述凝汽器为电厂已有的发电系统凝汽器或增设的第一凝汽器,当增设第一凝汽器时,第一凝汽器与电厂已有的发电系统凝汽器或空冷岛并联。 [0006] The condenser for the power plant has a power generation system or the first condenser condenser added when additional first condenser, the first condenser and the existing power plant condensing steam generation system Cooling Island or in parallel.

[0007] 对于热网的各个热力站,可以全部设置热泵型换热机组,也可以部分设置热泵型换热机组,其余部分仍然采用常规的水-水换热器,此时,一次网的回水温度会随设置热泵型换热机组比例的提高而降低。 [0007] For each thermal stations heating network, you can set all the heat pump heat exchanger unit to be part of the set heat pump heat exchanger unit, the rest are still using conventional water - water heat exchanger, at this time, a net return water temperature is set with heat pump heat exchanger unit increase in the proportion decreased.

[0008] 本实用新型系统不但适应于汽轮机乏汽水冷模式,即乏汽热量通过循环水带到冷却塔散热,还适应于乏汽空冷模式,即乏汽直接进入空冷岛中冷却。 [0008] The utility model system not only adapt to the lack of soda cold turbine model, that the waste steam heat to the water circulating through the cooling tower, also adapted to the lack of air-cooled gasoline mode, ie exhaust steam directly into the cooling air cooling island.

[0009] 对于汽轮机乏汽采用水冷模式的发电系统,可以增设第一凝汽器与原有发电系统凝汽器并联,专门用于加热一次网回水,不会影响电厂原有发电系统;也可以通过系统切换,利用电厂已有的发电系统凝汽器加热一次网回水。 [0009] For the water-cooled exhaust steam turbine power generation system model, can be added to the original first generation system condenser Condenser parallel, a network dedicated to heating backwater, will not affect the existing power plant systems; also You can switch the system using the existing power plant condenser heat power generation system once net return.

[0010] 对于汽轮机乏汽采用空冷模式的发电系统,增设第一凝汽器与空冷岛并联,用于加热一次网回水。 [0010] For the exhaust steam turbine power generation system using air-cooled models, with the addition of the first air-cooled condenser island in parallel, one for heating net return.

[0011] 当乏汽余热不能全部回收时,剩余部分的乏汽热量仍然可以通过循环水带到冷却塔散热或直接进入空冷岛中冷却,不会对原有发电系统造成不利影响。 [0011] When the waste steam heat can not be fully recovered, the remaining part of the waste steam heat can still be taken by the circulating water cooling tower or directly into the cooling air cooling island, it will not adversely affect the existing power generation system.

[0012] 本实用新型的有益效果体现在两个方面:第一,在热网各个热力站中设置热泵型换热机组,较常规集中供热方式,进一步降低了一次网回水温度,使得一次网热水的供、回水温差进一步增大,提高了热网输送能力,并且低温的一次网回水为回收电厂汽轮机乏汽余热提供了可能;第二,在电厂中利用凝汽器初级加热一次网回水,有效回收了汽轮机乏汽余热,电厂的供热能力得到提高。 [0012] The utility model has the beneficial effects reflected in two aspects: First, set the heat pump heat exchanger unit in the respective heating station heating network, the more conventional central heating mode, further reducing the net return temperature once, so once net hot water supply and return water temperature is further increased to improve the heat transport network capacity and low network backwater of a power plant for the recovery of turbine exhaust steam heat may be provided; secondly, use condenser primary heating in power plant a network backwater, effective recovery of the turbine exhaust steam heat, heat capacity of the plant is improved.

附图说明 BRIEF DESCRIPTION

[0013] 图1为本实用新型系统用于乏汽水冷模式时设置第一凝汽器加热一次网回水的流程示意图; [0013] FIG. 1 is a first condenser system setup utility model heating a net return of a schematic flow diagram for the time spent soda cold mode;

[0014] 图2为本实用新型系统用于乏汽空冷模式时设置第一凝汽器加热一次网回水的流程示意图; [0014] FIG. 2 is a utility model system for setting a first heating time network backwater Condenser schematic flow when the exhaust steam air cooling mode;

[0015] 图3为本实用新型系统在热网热力站中部分设置热泵型换热机组的流程示意图; [0015] FIG. 3 is part of the setup process the utility model system heat pump heat exchanger unit in a schematic heating network heating station;

[0016] 图4为本实用新型系统用于乏汽水冷模式时利用已有发电系统凝汽器加热一次网回水的流程示意图; [0016] FIG. 4 is a utility model system for lack of cold soda mode power generation system using the existing network of condenser heat once backwater flow diagram;

[0017] 图中标号:l_a、第一凝汽器;l_b、发电系统凝汽器;2、汽-水换热器;3、热泵型换热机组;4、水-水换热器;5、汽轮机;6、冷却塔;7、空冷岛。 [0017] FIG label: l_a, a first condenser; l_b, power generation system condenser; 2, steam - water heat exchanger; 3, the heat pump heat exchanger unit; 4, water - water heat exchanger; 5 Steam; 6, cooling towers; 7, air-cooled Island.

具体实施方式 detailed description

[0018] 下面的实施例可以使本专业技术人员更全面的理解本实用新型,但不以任何方式限制本实用新型。 [0018] The following examples are skilled in the art can make a more complete understanding of the present utility model, but do not limit the utility model in any way.

[0019] 实施例1 :如图1所示,电厂内汽轮机乏汽采用水冷模式,汽轮机的乏汽出口与发电系统凝汽器Ι-b相连,汽轮机的抽汽管路与汽-水换热器2相连,本实施例在热网的各个热力站中均设置热泵型换热机组3 (专利号:ZL200810101064. 5),在电厂内设置第一凝汽器Ι-a与已有的电厂发电系统凝汽器l_b并联。 [0019] Example 1: 1, within the steam turbine exhaust steam power plant water-cooling mode, the turbine exhaust steam condenser outlet and the power generation system Ι-b is connected to the turbine extraction steam piping and steam - water heat exchanger 2 is connected, in this embodiment, each of the heating station heating network in both setting heat pump heat exchanger unit 3 (patent number:. ZL200810101064 5), a first condenser Ι-a set of existing power plants in power generation l_b parallel condenser system.

[0020] 高温的一次网供水送出电厂后,进入到上述热泵型换热机组3中,加热二次网热水供给热用户,同时实现一次网热水回水降温,低温的一次网回水返回电厂后,首先进入第一凝汽器l_a中,被汽轮机5的乏汽加热,再进入汽-水换热器2中,被来自汽轮机5抽汽管路的高温蒸汽继续加热,加热后的高温一次网热水作为一次网供水送出电厂,完成循环。 [0020] After the temperature of a water network fed power plant, into the heat pump heat exchanger unit (3), the secondary heating network hot water supply heat users, while achieving a net return of hot water cooling, low temperature once backwater net return after the power plant, the first to enter the first condenser l_a, the lack of heated steam turbine 5, and then into the steam - water heat exchanger 2, the high temperature steam from the steam turbine extraction steam pipe heating was continued for 5, after heated to high temperatures a hot water network as the primary network water fed power plant, completing the cycle.

[0021] 当汽轮机5的乏汽余热无法全部回收时,仍然可以通过发电系统凝汽器l_b中的循环水将剩余部分的乏汽余热带到冷却塔6中排放掉,因此,不会对电厂原有发电系统造成不利影响。 [0021] When the heat exhaust steam turbine 5 can not be fully recovered, can still power system l_b condenser water loop in the remaining part of the waste steam heat to the cooling tower 6 discharged, therefore, no power plant original power system adversely affected.

[0022] 实施例2 :如图2所示,电厂内汽轮机乏汽采用空冷模式,汽轮机的乏汽出口与空冷岛7相连,本实用新型系统在热网的各个热力站中均设置热泵型换热机组3,在电厂内设置第一凝汽器Ι-a与电厂空冷岛7并联。 [0022] Example 2: 2, within the turbine exhaust steam power plant air cooling mode, the outlet is connected to the waste steam turbine with air cooling island 7, the utility model heat pump systems are set up in each heat exchange station in heating network thermal unit (3), a first condenser Ι-a plant with air-cooled power plant in the island 7 in parallel. 与实施例1相比较,本实施例的电厂汽轮机乏汽采用了空冷模式,其它与实施例1相同。 Example 1 compared exhaust steam turbine power plant according to this embodiment uses air cooling mode, the same as in Example 1 other.

[0023] 当汽轮机5的乏汽余热无法全部回收时,剩余部分的乏汽仍然可以直接进入到电厂空冷岛7中冷却,因此,不会对电厂原有发电系统造成不利影响。 [0023] When the heat exhaust steam turbine 5 can not be fully recovered, and the remaining portion of the exhaust steam can still go directly to the power plant cooling Cooling Island 7, therefore, does not adversely affect the original power plant systems.

[0024] 实施例3 :如图3所示,在热网的各个热力站中部分设置了热泵型换热机组3,另一部分设置了常规的水-水换热器4,在电厂内设置第一凝汽器Ι-a与已有的电厂发电系统凝汽器l_b并联。 [0024] Example 3: 3, in each of the thermal thermal station network in part provided heat pump heat exchanger unit 3, and the other portion is provided of a conventional water - water heat exchanger 4 is provided in the first power plant a condenser Ι-a power generation system with the existing condenser l_b parallel. 与实施例1相比较的不同之处在于,本实施例的热网热力站中部分设置了常规的水-水换热器4,无法使一次网回水降温至低于二次网的回水温度,这部分高温一次网回水将与经过热泵型换热机组3降温的低温一次网回水混合后再返回电厂中加热,因此,热网热力站中设置热泵型换热机组3的比例越高,一次网的回水温度就越低,就越有利于回收汽轮机5的乏汽余热。 Example 1 and Comparative embodiment differs in that the heating network thermal station of the present embodiment is provided in part of a conventional water - water heat exchanger 4, can not make a net return to cool to below the secondary network of backwater temperature, high-temperature part of a network which will return after a heat pump heating and cooling the low temperature heat exchanger unit (3) mixing a net return and then return to the plant, and therefore, the thermal thermal station network set heat pump heat exchanger unit 3 ratio more high, a lower net return temperature, the more conducive to recovery turbine exhaust steam heat 5.

[0025] 实施例4 :如图4所示,电厂内汽轮机乏汽采用水冷模式,汽轮机的乏汽出口与发电系统凝汽器l_b相连,汽轮机的抽汽管路与汽-水换热器2相连,在热网的各个热力站中均设置热泵型换热机组3,高温的一次网供水送出电厂后,进入到上述热泵型换热机组3 中,加热二次网热水供给热用户,同时实现一次网热水回水降温,并远远低于二次网的回水温度,低温的一次网回水返回电厂后,首先进入发电系统凝汽器l_b中,被汽轮机5的乏汽加热,再进入汽-水换热器2中,被来自汽轮机5抽汽管路的高温蒸汽继续加热,加热后的高温一次网热水作为一次网供水送出电厂,完成循环。 [0025] Example 4: 4, the inner water-cooled power plant turbine exhaust steam mode, exhaust steam outlet of the steam turbine power generation system l_b condenser connected to the steam turbine extraction steam piping and steam - water heat exchanger 2 connected in various thermal stations are set in the heating network heat pump heat exchanger unit 3, a high temperature of the water supply network after sending the plant and into the heat pump heat exchanger unit (3), heating the hot water supply heat the secondary network users, while to achieve a net return of hot water to cool, and far below the secondary network of backwater temperature, low temperature after a net return return power plant, the first to enter the power generation system condenser l_b, the lack of heated steam turbine 5, re-entering the steam - water heat exchanger 2, the high temperature steam from the steam turbine extraction steam pipe 5 continues heating, hot water heating after the first network as the primary network water fed power plant, completing the cycle.

[0026] 与实施例1相比较,本实施例在电厂内不另外设置第一凝汽器Ι-a,而是通过系统切换,将低温的一次网回水引入到电厂已有的发电系统凝汽器Ι-b中,被汽轮机5的乏汽加热,当乏汽余热无法全部回收时,可以通过阀门调节,使得剩余部分乏汽热量通过循环水带到冷却塔6中排放,不会影响发电安全。 [0026] Example 1 as compared with the first embodiment is not additionally provided in the condenser Ι-a plant, but through the switching system, at low temperature is introduced into the plant a net return existing power generation system condensate air heaters Ι-b, the exhaust steam heated by the steam turbine 5, when all the waste steam heat can not be recovered, the valve can be adjusted so that the remaining portion of the waste steam heat to the cooling tower 6 discharged by circulating water will not affect the power generation Safety.

[0027] 以上所述,仅为本实用新型较佳的具体实施方式,但本实用新型的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本实用新型揭露的技术范围内,可轻易想到的变化或替换,都应涵盖在本实用新型的保护范围之内。 Above [0027] said, only the utility model preferred specific embodiments, but the scope of protection of the utility model is not limited to, any skilled skilled technical scope disclosed in the utility model, changes can be easily replaced or thought, should fall within the scope of the utility model protection. 因此,本实用新型的保护范围应该以权利要求的保护范围为准。 Accordingly, the scope of protection of the utility model should be based on the scope of the claims shall prevail.

Claims (8)

1. 一种低温回水的集中供热系统,其特征在于:在热网的热力站中设置热泵型换热机组(3),一次网供水送出电厂后,进入到所述热泵型换热机组(3)中,加热二次网热水供给热用户,同时实现一次网热水降温,一次网回水回到电厂后,首先进入凝汽器中,被汽轮机(5)的乏汽加热,再进入汽-水换热器O)中,被来自汽轮机(¾抽汽管路的蒸汽进一步加热,加热后作为一次网供水送出电厂;所述凝汽器为电厂已有的发电系统凝汽器(1-b),或增设的第一凝汽器(1-a)。 A cold backwater central heating system, comprising: setting heat pump heat exchanger unit in thermal station in heating network (3), a water supply network after sending the plant and into the heat pump heat exchanger unit (3) heating the hot water supply heat the secondary network users, while achieving a net cooling of hot water, a net return back to the power plant, the first into the condenser, the heated turbine (5) of the exhaust steam, and then into the steam - water heat exchanger O), the turbine is from the (¾ Extraction steam piping further heating, water heating as the primary network sends power plants; the condenser for the power plant has a power generation system condenser ( 1-b), or the addition of a first condenser (1-a).
2.根据权利要求1所述的低温回水的集中供热系统,其特征在于:热网的各个热力站中全部设置热泵型换热机组(3)。 The cold backwater central heating system as claimed in claim 1, characterized in that: each thermal station in heating network all set heat pump heat exchanger unit (3).
3.根据权利要求1所述的低温回水的集中供热系统,其特征在于:热网的各个热力站中部分设置热泵型换热机组(3),其余部分仍然采用常规的水-水换热器0)。 3. The cold backwater central heating system as claimed in claim 1, characterized in that: each thermal station in heating network portion is provided heat pump heat exchanger unit (3), the rest are still using conventional water - water exchange thermal 0).
4.根据权利要求1所述的低温回水的集中供热系统,其特征在于:汽轮机乏汽为水冷模式,采用所述增设的第一凝汽器(1-a)加热一次网回水,第一凝汽器(1-a)与原有发电系统凝汽器(1-b)并联。 4. The low return of one of the central heating system of claim wherein: the turbine exhaust steam is cooled mode, using the first of the additional condenser (1-a) heating a net return, a first condenser (1-a) with the original power system condenser (1-b) in parallel.
5.根据权利要求1所述的低温回水的集中供热系统,其特征在于:汽轮机乏汽为水冷模式,电厂内可以通过系统切换,利用电厂已有的发电系统凝汽器(1-b)来加热一次网回水。 5. The cold backwater central heating system according to claim 1, wherein: the turbine exhaust steam is cooled mode, you can switch the system within the power plant, the use of existing power plant condenser system (1-b ) to heat a net return.
6.根据权利要求4或5所述的低温回水的集中供热系统,其特征在于:当乏汽余热不能全部回收时,剩余部分的乏汽热量通过循环水带到冷却塔(6)中散失。 6. The low temperature backwater of 4 or 5, wherein the central heating system of claim, wherein: when the waste steam heat can not be fully recovered, the remaining part of the waste steam heat by circulating water to the cooling tower (6) loss.
7.根据权利要求1所述的低温回水的集中供热系统,其特征在于:汽轮机乏汽为空冷模式,采用所述增设的第一凝汽器(1-a)加热一次网回水,第一凝汽器(1-a)与电厂已有的空冷岛(7)并联。 7. The cold backwater central heating system according to claim 1, wherein: the turbine exhaust steam is air-cooled model, using the first of the additional condenser (1-a) heating a net return, a first condenser (1-a) with an existing power plant Cooling Island (7) in parallel.
8.根据权利要求7所述的低温回水的集中供热系统,其特征在于:当乏汽余热不能全部回收时,剩余部分的乏汽直接进入空冷岛(7)中冷却。 According to claim cold backwater central heating system 7, characterized in that: when the waste steam heat can not be fully recovered, and the remaining portion of the exhaust steam directly into the air-cooled Island (7) for cooling.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102297467A (en) * 2011-08-19 2011-12-28 北京华清泰盟科技发展有限公司 A cryogenic backwater central heating system
CN103115387A (en) * 2013-03-22 2013-05-22 李洪波 Heating system using municipal heat-supply one-time net backwater as heat source
CN103512075A (en) * 2013-09-25 2014-01-15 清华大学 Absorption heat exchanger unit combined with boiler

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